Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business Operations - Additional Information (Details)

v3.20.2
Organization and Description of Business Operations - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Retained Earnings (Accumulated Deficit) $ (132,967,000) $ (132,967,000)   $ (132,967,000)   $ (120,111,000)
Common Shares [Member]            
Shares Issued, Price Per Share $ 2.40 $ 2.40   $ 2.40    
Stock Issued During Period Shares Common Shares For At The Market Offering   2,311,062 1,142,298 3,614,344 2,230,524  
Stock Issued During Period Value Common Shares For At The Market Offering Gross       $ 8,700,000    
Stock Issued During Period Value Common Shares For At The Market Offering Net       $ 8,400,000    
Underwritten Public Offering [Member]            
Stock Issued During Period, Shares, New Issues 7,321,429     7,321,429    
Shares Issued, Price Per Share $ 2.80 $ 2.80   $ 2.80    
Stock Issued During Period, Value, New Issues $ 20,500,000     $ 20,500,000    
Proceeds from Issuance Underwritten Public Offering 18,900,000     18,900,000    
Payments of Stock Issuance Costs $ 1,600,000     $ 1,600,000